As of 1:48 AM EDT on September 21, 2025, all 6 cities in Frederick County, VA in our database have a UV Index reading of 0, indicating no radiation from the sun.
Over the next 24 hours, the highest UV Index reading in Frederick County, VA is expected to be 3.8 in Stephens City between 3:00 PM - 4:00 PM EDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |